How do I get my husband with delusional disorder diagnosed?

I believe my husband has delusional disorder although he does not have a diagnosis. We are currently separated. He believes things about me and our relationship that are not true. A big part of what he believes is that although we are separated I actually have amnesia and if I would remember that I love him then we could get back together. I am over this relationship for separate reasons other than his mental health. I am worried about him escalating if he doesn't get help. I worry about what he could do to me or my children if I don't "remember". Aside from the things he believes about me he functions well.